Michael Lutz is one of the best Twine authors, with My Father's Long Long Legs and The Uncle that works for Nintendo. This game shares the excellent visual effects and tight writing of the original.
You play a character in an FPS, with a joystick simulate by "press A", and so on. You can play through a scenario multiple times, then enter a bizarre multiplayer game. Eventually, you enter a completely new scenario involving the bloodlord, whom you confront.
All of this gets supremely tedious; the repetition at the beginning, the final battle with pages and pages of texts, the slowly animated denouement. I lost interest multiple times, but played through out of curiosity. It makes some good points about gaming culture, though.
Contains strong profanity.